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Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Tunable two-stage self-coupled optical waveguide resonators.

Zhi Zou1, Linjie Zhou, Xiaomeng Sun

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Optics Letters
|April 19, 2013
PubMed
Summary
This summary is machine-generated.

We demonstrate tunable two-stage self-coupled optical waveguide resonators. These devices exhibit coupled-resonator-induced-transparency and bandstop filtering, with tunable resonance spectra via microheaters or diodes.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Waveguide Technology

Background:

  • Optical resonators are fundamental components in photonics.
  • Self-coupled optical waveguides (SCOWs) offer unique light manipulation properties.
  • Cascaded resonators can create complex spectral responses.

Purpose of the Study:

  • To design and experimentally realize tunable two-stage SCOW resonators.
  • To investigate the spectral characteristics, including coupled-resonator-induced-transparency (CRIT) and bandstop filtering.
  • To demonstrate tunability of the resonance spectrum using integrated microheaters or diodes.

Main Methods:

  • Fabrication of two-stage SCOW resonators.
  • Experimental characterization of transmission spectra.
  • Integration of p-i-p microheaters and p-i-n diodes for tuning.
  • Theoretical modeling using the transfer matrix method.

Main Results:

  • Achieved coupled-resonator-induced-transparency (CRIT) in the transmission spectra.
  • Demonstrated high-order bandstop filtering characteristics.
  • Successfully tuned the resonance spectrum using both microheaters and diodes.
  • Validated experimental findings with theoretical modeling.

Conclusions:

  • Tunable two-stage SCOW resonators are feasible and exhibit desired optical functionalities.
  • The integrated tuning mechanisms provide effective control over the spectral response.
  • This work contributes to the development of advanced optical filters and signal processing devices.